Pressure gauge



Sept. 18,1923.

A. E. GUY

PRESSURE GAUGE Filed Sept. 21 1921 lnnnnnnunnuulul Patented: Sept, l3, l o V a It fa ii l ALBERT E. GUY, or untrue s'rnrns ARMY.

rienssunn eauen.

' Application filediSeptembcr 21, 1923.. Serial No.-502',297,

(FI LED UNDERTHES ACT Gil MARCH 1883 22 STAT. L. 625.

T 0 all whom time 004mm.

'Be it known that I, ALBERTE. GUY, mayOI,

Ordnance Department, United Statesirmy,

acitizen of the United States,stationed at Aberdeen Proving Ground, Aberdeen, Mary land, have invented an Improvement in Pressure Gauges, of which the fol owing is a specification. I V

' The .iinvention, described herein maylbe used by the Government, or any of its oilicersor employees,- inprosecution of work for the Government, .or by any other person in the United'States, without payment to me of any royalty thereon, in accordance with the actot March 8, 1888;

The subject of this invention is a pressure gauge intendechprimarily, tor-measurin exceedingly highifiuid pressures. I

awhile I am aware that pressure gauges are old and welllrnown, I am of the opinion thatn'o satisfactory gauge has been devised for measuring exceedingly high pressures,

' such, for instance, as those used-in the treatmentor gun tubes for distending and set; i t ng or compacting the metal therein.

; In providing gaugeo't thischa'racter it is essential that the material .etwhich the gauge is 'coi'uposed wince capable of. With standing the high pressures to which it IS The objects of the invention are further attained by providing a gauge in which pressures are measured by the axial or linear elongation of the cylinden V With these and other objects in View, my invention consists in the novel arrangement and combination of parts and in the details of construction and manufacture herein de-- scribed and claimed, it being'understood that changes in the precise embodiment of the invention herein disclosed may be made withthe scope of what is claimed without ale-- parting from the spirit of the invention.

A. practical embodiment of the invention is illustrated inthe accompanying drawing, wherein the figureis an elevation, partly in longitudinal section. of a gauge constructed in accordance with the'invention.

Referring to the drawing by numerals of reference:

l have provided a standard or support 1,

to the upper end of which is secured, as by bolts 2, a bracket '3. he bracket 3 is apertured to receive with abinding fit, the pres sure tube or cylinder 4t, which may be held suspended in the bracket by having a flange or collar'5 formed on its upper end. A set screw 6 may befturther employed if desired for binding the cylinder in placep The upper end or head of the cylinder 1 is apertured and threaded to receive the threaded end of the pipe 7, through which pressure fluid is supplied to the cylinder.

The ylinder 4 is specially constructed to withstand hi h ressures and to this end I b i prefer to first work the cylinder with high pressures which distend the material of the cylinder beyond its elasticlimitpthus raising the elastic. limit beyond the natural limit of the metal of which it is composed or constructed. str'ucted any pressure below the maximum With a cylinder so conpressure originally applied may be supplied to the cylinder without causing new permanent deformation of the metal of the cylinder.

When pressure fluid is applied to the cylinder through the pipe '7 a distortion of the cylinder takes place both radially or later ally and axially. The axial distortion causes the cylinder to elongate and it is this elongation of the cylinder that is made use of in measuring the pressure.

In order that the elongation or axial expansion of the cylinder may be noted, a collar 8 encircles the lower end of the cylinder with a. close binding lit and may be further bound in place thereon by a set screw 9. The collar is provided with a radially extending lug 10, apertured to receive one end of a rod 11, which may be bound therein in any suitable manner, as by means of a set screw 12. is secured an indicating dial 13 provided with an operating rod 14 the free end of To the other end of the rod 11 which is contacted by an adjusting member, such as the adjusting screw 15, threaded through a threaded aperture formed in an extension of the bracket The adjusting screw may be threaded inor out tcproperly set the indicator so that the readings thGTQOTii WlIGH pressure applied to the cylinder, may be correct.

In practice the device is operated in the following manner. 7

The ad usting screw 15 is turned in or out as the needmay be to bring the pointer on lI 1(l1('ZltOl d al to zero setting. The fluid; the pressure of which is to be measured 15 then admitted to the interior of the cylinder through, the pipe 7 causing distension and elongation of the cylinder. As the cyhnde' elongates the rod. 11 and indicator 1?? are .inoyed away from the end of the adjusting screw 15, thereby allowing the cperatin rod 14: to extrude further from the casing ofi the indicator under the operation of snitahle mechanism contained in the casing, which causes the pointer on the indicator to rotate on. ts piyot tlirongh a sui'iicient angle to point to that graduation corresponding to tl iepressgure within the cylinder. When the 7 pressure is relieved, the cylinder, because of the elasticity of the material, willassume its normalproportions.

laying described my invention, what I clai1n,'is: V

l. A pressure gaugeyincluding a support,

a bracket seinrred to the support, said bracket being apertured. a cylinder inserted throui h the aaerture in the bracket and l' uns iircm the bracket said cylinder formed with iv per pheral annular flange at its upper end and resting on the brackena collar encircling the cylinder at its lower end and rigidly secured thereto, said collar formed with an f extension, a rod having its lower end sesupport, a cylinder rigidly connected to and suspended from the bracket, a pipe communicating Withthe interiorof the cylinder through the upper end thereot, a collar en-.

circling thelower end of the cylinder, an ]11Cl1C2Il;O l, nieansx-onnecting the indlcator to thecollar and means carried by the bracket for adjusting the indicator.

3. A pressure gauge, including a support, a cylinder hung from the upper end of the support and rigidly connected thereto. a pipe communicating with the interior of the cylinder through the upper end thereof, an indicator, means connecting the indicator to the lower end or" the cylinder and means conncctedjtc the-upper end-of the cylinder for adjusting the indicator.

a. A pressure gauge, including .a'cylinder.

a pipe communicating with the interior of the cylinder thrOughcneend thereof, an in, "Cl1C1tOI,"n1!/DS connecting the ind eatorto the other'end of: the cylinder, and means secured to the first mentioned end of the'cylinder 15madjusting' the indicator. 7

5. A. pressuregauge. includinga metallic cylinder ubjected 'to prjessnre during work- 1.

mg to increase the elastic limit thereof, means for agl'mitting pressure-fluid to said cylinder and-means connected to the cylinforfindicatingthe pressure by the elongation of the cylinder. V

' ALBERT near, 

